Looks almost like it has some RIR blood.I don't really know what color you would call him. He is probably splash but the red it not normal for a Marans.
This is the second roo that has popped up with that odd coloring.
There was someone a long ways back that want to breed splash and splash coppers and if I recall that is the color they were going for in the coppers. It was way off but they didn't care so maybe those birds have been made and are being sold regularly.